POI测试使用

Posted 2020-10-17 jiabei

由于项目中使用POI导入,导出excel,对其中几个获取行号和列号的方法返回的结果感到迷惑,

所以特地写了代码进行测试,这里记录一下,方便以后查看.

 

结论:

getLastRowNum: 返回excel中最后一行数据的物理行号减1,空Sheet返回0.

getPhysicalNumberOfRows:返回所有非空行的总行数,空sheet返回0.

getRow(int index): 索引从0开始,0对应excel中的第一行.空行返回null

getLastCellNum:返回行的最后一列数据的列号,从1开始

getPhysicalNumberOfCells:返回所有非空列的总列数.

getCell(int index):索引从0开始,0对应excel中的第一列.空列返回null

 

下列为测试代码,比较简单,不多解释:

// sheet无任何数据

System.out.println("getLastRowNum:"+sheet.getLastRowNum());

System.out.println("getPhysicalNumberOfRows:"+sheet.getPhysicalNumberOfRows());

System.out.println("getLastCellNum:"+sheet.getRow(0).getLastCellNum());// 报错,空指针,行为null

System.out.println("getPhysicalNumberOfCells:"+sheet.getRow(0).getPhysicalNumberOfCells());//报错,空指针,行为null

console:

getLastRowNum:0

getPhysicalNumberOfRows:0

Exception in thread "main" java.lang.NullPointerException

at com.sample.utils.ExcelUtilTest.testPOI(ExcelUtilTest.java:92)

at com.sample.utils.ExcelUtilTest.main(ExcelUtilTest.java:63)

 

 // sheet第一行第一列有数据

System.out.println("getLastRowNum:"+sheet.getLastRowNum());

System.out.println("getPhysicalNumberOfRows:"+sheet.getPhysicalNumberOfRows());

System.out.println("getLastCellNum:"+sheet.getRow(0).getLastCellNum());

System.out.println("getPhysicalNumberOfCells:"+sheet.getRow(0).getPhysicalNumberOfCells());

console:

getLastRowNum:0

getPhysicalNumberOfRows:1

getLastCellNum:1

getPhysicalNumberOfCells:1

 

 // sheet第二行第二列有数据

System.out.println("getLastRowNum:"+sheet.getLastRowNum());

System.out.println("getPhysicalNumberOfRows:"+sheet.getPhysicalNumberOfRows());

System.out.println("getLastCellNum:"+sheet.getRow(0).getLastCellNum());// 报错,空指针,行为null

System.out.println("getPhysicalNumberOfCells:"+sheet.getRow(0).getPhysicalNumberOfCells());// 报错,空指针,行为null

console:

getLastRowNum:1

getPhysicalNumberOfRows:1

Exception in thread "main" java.lang.NullPointerException

at com.sample.utils.ExcelUtilTest.testPOI(ExcelUtilTest.java:92)

at com.sample.utils.ExcelUtilTest.main(ExcelUtilTest.java:63)

 

// sheet第二行第二列有数据

System.out.println("getLastRowNum:"+sheet.getLastRowNum());

System.out.println("getPhysicalNumberOfRows:"+sheet.getPhysicalNumberOfRows());

System.out.println("getLastCellNum:"+sheet.getRow(1).getLastCellNum());

System.out.println("getPhysicalNumberOfCells:"+sheet.getRow(1).getPhysicalNumberOfCells());

System.out.println("getCell:" + row.getCell(1));

console:

getLastRowNum:1

getPhysicalNumberOfRows:1

getLastCellNum:2

getPhysicalNumberOfCells:1

getCell:文本